1 /* 2 * OHCI HCD (Host Controller Driver) for USB. 3 * 4 * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at> 5 * (C) Copyright 2000-2005 David Brownell 6 * (C) Copyright 2002 Hewlett-Packard Company 7 * (C) Copyright 2008 Magnus Damm 8 * 9 * SM501 Bus Glue - based on ohci-omap.c 10 * 11 * This file is licenced under the GPL. 12 */ 13 14 #include <linux/interrupt.h> 15 #include <linux/jiffies.h> 16 #include <linux/platform_device.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/sm501.h> 19 #include <linux/sm501-regs.h> 20 21 static int ohci_sm501_init(struct usb_hcd *hcd) 22 { 23 return ohci_init(hcd_to_ohci(hcd)); 24 } 25 26 static int ohci_sm501_start(struct usb_hcd *hcd) 27 { 28 struct device *dev = hcd->self.controller; 29 int ret; 30 31 ret = ohci_run(hcd_to_ohci(hcd)); 32 if (ret < 0) { 33 dev_err(dev, "can't start %s", hcd->self.bus_name); 34 ohci_stop(hcd); 35 } 36 37 return ret; 38 } 39 40 /*-------------------------------------------------------------------------*/ 41 42 static const struct hc_driver ohci_sm501_hc_driver = { 43 .description = hcd_name, 44 .product_desc = "SM501 OHCI", 45 .hcd_priv_size = sizeof(struct ohci_hcd), 46 47 /* 48 * generic hardware linkage 49 */ 50 .irq = ohci_irq, 51 .flags = HCD_USB11 | HCD_MEMORY | HCD_LOCAL_MEM, 52 53 /* 54 * basic lifecycle operations 55 */ 56 .reset = ohci_sm501_init, 57 .start = ohci_sm501_start, 58 .stop = ohci_stop, 59 .shutdown = ohci_shutdown, 60 61 /* 62 * managing i/o requests and associated device resources 63 */ 64 .urb_enqueue = ohci_urb_enqueue, 65 .urb_dequeue = ohci_urb_dequeue, 66 .endpoint_disable = ohci_endpoint_disable, 67 68 /* 69 * scheduling support 70 */ 71 .get_frame_number = ohci_get_frame, 72 73 /* 74 * root hub support 75 */ 76 .hub_status_data = ohci_hub_status_data, 77 .hub_control = ohci_hub_control, 78 #ifdef CONFIG_PM 79 .bus_suspend = ohci_bus_suspend, 80 .bus_resume = ohci_bus_resume, 81 #endif 82 .start_port_reset = ohci_start_port_reset, 83 }; 84 85 /*-------------------------------------------------------------------------*/ 86 87 static int ohci_hcd_sm501_drv_probe(struct platform_device *pdev) 88 { 89 const struct hc_driver *driver = &ohci_sm501_hc_driver; 90 struct device *dev = &pdev->dev; 91 struct resource *res, *mem; 92 int retval, irq; 93 struct usb_hcd *hcd = NULL; 94 95 irq = retval = platform_get_irq(pdev, 0); 96 if (retval < 0) 97 goto err0; 98 99 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 100 if (mem == NULL) { 101 dev_err(dev, "no resource definition for memory\n"); 102 retval = -ENOENT; 103 goto err0; 104 } 105 106 if (!request_mem_region(mem->start, resource_size(mem), pdev->name)) { 107 dev_err(dev, "request_mem_region failed\n"); 108 retval = -EBUSY; 109 goto err0; 110 } 111 112 /* The sm501 chip is equipped with local memory that may be used 113 * by on-chip devices such as the video controller and the usb host. 114 * This driver uses dma_declare_coherent_memory() to make sure 115 * usb allocations with dma_alloc_coherent() allocate from 116 * this local memory. The dma_handle returned by dma_alloc_coherent() 117 * will be an offset starting from 0 for the first local memory byte. 118 * 119 * So as long as data is allocated using dma_alloc_coherent() all is 120 * fine. This is however not always the case - buffers may be allocated 121 * using kmalloc() - so the usb core needs to be told that it must copy 122 * data into our local memory if the buffers happen to be placed in 123 * regular memory. The HCD_LOCAL_MEM flag does just that. 124 */ 125 126 if (!dma_declare_coherent_memory(dev, mem->start, 127 mem->start - mem->parent->start, 128 resource_size(mem), 129 DMA_MEMORY_MAP | 130 DMA_MEMORY_EXCLUSIVE)) { 131 dev_err(dev, "cannot declare coherent memory\n"); 132 retval = -ENXIO; 133 goto err1; 134 } 135 136 /* allocate, reserve and remap resources for registers */ 137 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 138 if (res == NULL) { 139 dev_err(dev, "no resource definition for registers\n"); 140 retval = -ENOENT; 141 goto err2; 142 } 143 144 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev)); 145 if (!hcd) { 146 retval = -ENOMEM; 147 goto err2; 148 } 149 150 hcd->rsrc_start = res->start; 151 hcd->rsrc_len = resource_size(res); 152 153 if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, pdev->name)) { 154 dev_err(dev, "request_mem_region failed\n"); 155 retval = -EBUSY; 156 goto err3; 157 } 158 159 hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len); 160 if (hcd->regs == NULL) { 161 dev_err(dev, "cannot remap registers\n"); 162 retval = -ENXIO; 163 goto err4; 164 } 165 166 ohci_hcd_init(hcd_to_ohci(hcd)); 167 168 retval = usb_add_hcd(hcd, irq, IRQF_SHARED); 169 if (retval) 170 goto err5; 171 device_wakeup_enable(hcd->self.controller); 172 173 /* enable power and unmask interrupts */ 174 175 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1); 176 sm501_modify_reg(dev->parent, SM501_IRQ_MASK, 1 << 6, 0); 177 178 return 0; 179 err5: 180 iounmap(hcd->regs); 181 err4: 182 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 183 err3: 184 usb_put_hcd(hcd); 185 err2: 186 dma_release_declared_memory(dev); 187 err1: 188 release_mem_region(mem->start, resource_size(mem)); 189 err0: 190 return retval; 191 } 192 193 static int ohci_hcd_sm501_drv_remove(struct platform_device *pdev) 194 { 195 struct usb_hcd *hcd = platform_get_drvdata(pdev); 196 struct resource *mem; 197 198 usb_remove_hcd(hcd); 199 release_mem_region(hcd->rsrc_start, hcd->rsrc_len); 200 usb_put_hcd(hcd); 201 dma_release_declared_memory(&pdev->dev); 202 mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 203 if (mem) 204 release_mem_region(mem->start, resource_size(mem)); 205 206 /* mask interrupts and disable power */ 207 208 sm501_modify_reg(pdev->dev.parent, SM501_IRQ_MASK, 0, 1 << 6); 209 sm501_unit_power(pdev->dev.parent, SM501_GATE_USB_HOST, 0); 210 211 return 0; 212 } 213 214 /*-------------------------------------------------------------------------*/ 215 216 #ifdef CONFIG_PM 217 static int ohci_sm501_suspend(struct platform_device *pdev, pm_message_t msg) 218 { 219 struct device *dev = &pdev->dev; 220 struct usb_hcd *hcd = platform_get_drvdata(pdev); 221 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 222 bool do_wakeup = device_may_wakeup(dev); 223 int ret; 224 225 if (time_before(jiffies, ohci->next_statechange)) 226 msleep(5); 227 ohci->next_statechange = jiffies; 228 229 ret = ohci_suspend(hcd, do_wakeup); 230 if (ret) 231 return ret; 232 233 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 0); 234 return ret; 235 } 236 237 static int ohci_sm501_resume(struct platform_device *pdev) 238 { 239 struct device *dev = &pdev->dev; 240 struct usb_hcd *hcd = platform_get_drvdata(pdev); 241 struct ohci_hcd *ohci = hcd_to_ohci(hcd); 242 243 if (time_before(jiffies, ohci->next_statechange)) 244 msleep(5); 245 ohci->next_statechange = jiffies; 246 247 sm501_unit_power(dev->parent, SM501_GATE_USB_HOST, 1); 248 ohci_resume(hcd, false); 249 return 0; 250 } 251 #else 252 #define ohci_sm501_suspend NULL 253 #define ohci_sm501_resume NULL 254 #endif 255 256 /*-------------------------------------------------------------------------*/ 257 258 /* 259 * Driver definition to register with the SM501 bus 260 */ 261 static struct platform_driver ohci_hcd_sm501_driver = { 262 .probe = ohci_hcd_sm501_drv_probe, 263 .remove = ohci_hcd_sm501_drv_remove, 264 .shutdown = usb_hcd_platform_shutdown, 265 .suspend = ohci_sm501_suspend, 266 .resume = ohci_sm501_resume, 267 .driver = { 268 .name = "sm501-usb", 269 }, 270 }; 271 MODULE_ALIAS("platform:sm501-usb"); 272